JP2010012064A - Fire extinguishing equipment by mist and its fire extinguishing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technique for increasing fire extinguishing capability by mist. <P>SOLUTION: This one piece of fire extinguishing equipment includes: a plurality of first mist nozzles 12a, ..., 12a which are disposed facing a flame base part area 14 or an area 16 vertically above the flame base part area and perform jetting toward the flame base part area 14 or the area 16 vertically above the flame base part area; a plurality of second mist nozzles 12b, ..., 12b which have a jetting angle not crossing the jetting angle of the respective first mist nozzles 12a, jet the mist slower than the flow speed of the mist jetted from the respective first mist nozzles 12a, and jet the mist for interrupting at least a part of the distribution of air to the mist jetted from the respective first mist nozzles 12a from the periphery of piping provided with the respective first mist nozzles 12a; feeders 96 and 98 which feed a fire extinguishing agent to the respective first mist nozzles 12a; and feeders 92 and 94 which feed liquid to the respective second mist nozzles 12b. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a fire extinguishing facility using mist and a fire extinguishing method using the fire extinguishing facility.

Conventionally, a plurality of techniques using a mist for fire extinguishing have been proposed. For example, the pool fire extinguishing method proposed by the present applicant is a method of radiating water mist from a plurality of locations above the combustion surface toward the flame center axis above the flame base (Patent Document 1). As a result, the water mist turns into water vapor in the flame, and the pressure inside the flame is increased by the water vapor, so that the inflow of oxygen to the flame base is suppressed, and as a result, contributes to fire extinguishing. In addition, a pool fire extinguishing method using water mist has also been proposed in a pool fire extinguishing method proposed separately by the applicant of the present application (for example, Patent Document 2). Patent Document 4 discloses a technique in which a mist nozzle on the upper edge of a storage tank of benzene or the like prevents inflow of outside air taken in by a suction force peculiar to a fire column generated in a tank that is a limited open space. (Patent Document 4). However, the relationship between the mist injected from the mist nozzle in the open space and the air around the mist nozzle, or the air around the mist nozzle with respect to the mist injected toward the flame base region or the region vertically above the flame base region There is no suggestion or disclosure about the effects of
JP 2007-244723 A JP 2007-307096 A JP 2008-12158 A German Patent Invention No. 912658

  As described above, in order to facilitate the absorption of heat by the flame and promote the evaporation, a method of injecting the mist instead of the continuous rod-like radiation of the extinguishing agent to the flame is effective for extinction. However, when a general mist nozzle is used, part of the air around the mist nozzle or the pipe where the mist nozzle is arranged is taken into the mist flow up to the flame formed by the mist injection. A phenomenon has been discovered by the present inventors. As a result of this air intake, the surrounding air, particularly oxygen therein, is sent into the flame, so that it is difficult to sufficiently exert the fire extinguishing effect by the mist.

  This invention contributes to the further improvement of the fire extinguishing effect by mist by solving the above-mentioned technical subject. The inventor first focused on the fact that the air flow around the mist nozzle or / and the pipe where the mist nozzle is installed is generated by the mist injection. As a result of investigating this flow in detail, the inventor found that the fact that this flow substantially merged with the flow of mist up to the flame formed by the injection of mist had a bad influence on extinction by the previous mist. I found out that Therefore, the inventor has intensively studied fire extinguishing equipment that eliminates such a problem, and created the present invention.

  One fire extinguishing equipment of the present invention is arranged so as to face a flame base region or a region vertically above the flame base region, and injects the flame base region or a region vertically above the flame base region. A plurality of first mist nozzles and an injection angle that does not intersect with an injection angle of each of the first mist nozzles, and a mist that is slower than the flow rate of the mist injected from each of the first mist nozzles is injected; and A plurality of second mist nozzles for injecting mist for blocking at least a part of the flow of air from the periphery of the pipe provided with each of the first mist nozzles to the mist injected from each of the first mist nozzles; A feeding device that feeds a fire extinguishing agent to each of the first mist nozzles; and a feeding device that feeds a liquid to each of the second mist nozzles.

  This fire extinguishing equipment has an injection angle that does not intersect the injection angle of the first mist nozzle described above, injects a mist slower than the flow rate of the mist injected from the first mist nozzle, and injects from the first mist nozzle. A second mist nozzle for blocking at least a part of the air flow to the mist. That is, the mist injected from the second mist nozzle does not directly affect the mist injected from the first mist nozzle, but is injected from the first mist nozzle from the periphery of the pipe provided with the first mist nozzle. Block at least part of the flow of air to the mist. In other words, the second mist nozzle plays a role of supporting the first mist nozzle. Therefore, a part of the air around the pipe provided with the first mist nozzle is taken into the mist flow up to the flame formed by the mist injection from the first mist nozzle by the injection of the second mist nozzle. Can be prevented. As a result, the amount of air sent into the flame is reduced, and in particular, the flame base region is less likely to be disturbed, so that the fire extinguishing effect by mist is sufficiently enhanced. In addition, since the mist injection from the second mist nozzle described above reduces the flow rate of the mist from the first mist nozzle as compared with the conventional case, the mist entering the flame is more susceptible to heat from the flame than in the past. Become. As a result, it is considered that the ratio of vaporizing in the flame and contributing to fire extinguishing increases. Furthermore, since the mist injected from the second mist nozzle increases the amount of mist in the atmosphere surrounding the flame, the non-combustible space can be expanded accordingly. In this respect as well, the second mist nozzle supports the first mist nozzle.

  In the present application, the “injection angle” of the mist injected from the mist nozzle is typically near the orifice of the extinguishing agent injected from the mist nozzle 18 shown in FIG. 10 (for example, 10 cm away from the orifice). Means the spread angle θ of the flight range.

  Further, another fire extinguishing equipment of the present invention is arranged to face the flame base region or the region vertically above the flame base region, and toward the flame base region or the region vertically above the flame base region. A plurality of first mist nozzles to be injected, and an injection angle that does not substantially impede the flow of mist injected from each of the first mist nozzles, and the circumference of the pipe provided with each of the first mist nozzles A plurality of second mist nozzles for injecting mist for blocking at least a part of the flow of air to the mist injected from each of the first mist nozzles, and a fire extinguishing agent is sent to each of the aforementioned first mist nozzles. And a feeding device that feeds liquid to each of the second mist nozzles described above.

  This fire extinguishing equipment has an injection angle that does not substantially impede the flow of mist injected from the first mist nozzle, and at least part of the flow of air to the mist injected from the first mist nozzle. A second mist nozzle for blocking is provided. That is, the mist injected from the second mist nozzle does not directly affect the mist injected from the first mist nozzle, but is injected from the first mist nozzle from the periphery of the pipe provided with the first mist nozzle. Block at least part of the flow of air to the mist. In other words, the second mist nozzle plays a role of supporting the first mist nozzle. Therefore, a part of the air around the pipe provided with the first mist nozzle is taken into the mist flow up to the flame formed by the mist injection from the first mist nozzle by the injection of the second mist nozzle. Can be prevented. As a result, the amount of air sent into the flame is reduced, and in particular, the flame base region is less likely to be disturbed, so that the fire extinguishing effect by mist is sufficiently enhanced. In addition, since the mist injection from the second mist nozzle described above reduces the flow rate of the mist from the first mist nozzle as compared with the conventional case, the mist entering the flame is more susceptible to heat from the flame than in the past. Become. As a result, it is considered that the ratio of vaporizing in the flame and contributing to fire extinguishing increases. Furthermore, since the mist injected from the second mist nozzle increases the amount of mist in the atmosphere surrounding the flame, the non-combustible space can be expanded accordingly. In this respect, the second mist nozzle supports the first mist nozzle.

  In addition, one fire extinguishing method of the present invention is arranged to face a flame base region or a region vertically above the flame base region, and toward the flame base region or a region vertically above the flame base region. A step of supplying a fire extinguishing agent to the plurality of first mist nozzles to be injected, an injection angle that does not intersect the injection angle of each of the first mist nozzles, and a flow rate of mist injected from the first mist nozzle A step of supplying liquid to a plurality of second mist nozzles for injecting a slow mist, a step of injecting mist from each of the first mist nozzles, and a mist from each of the second mist nozzles. Accordingly, at least a part of the flow of air from the periphery of the pipe provided with each first mist nozzle to the mist ejected from each first mist nozzle is blocked. And a process.

  According to this fire-extinguishing method, a plurality of second mist nozzles that have a spray angle that does not intersect with the spray angle of the first mist nozzle described above and that eject a mist slower than the flow rate of the mist sprayed from the first mist nozzle. However, it interrupts | blocks at least one part of the distribution | circulation of the air from the circumference | surroundings of piping provided with the 1st mist nozzle to the mist injected from the 1st mist nozzle. That is, the mist injected from the second mist nozzle does not directly affect the mist injected from the first mist nozzle, but is injected from the first mist nozzle from the periphery of the pipe provided with the first mist nozzle. Block at least part of the flow of air to the mist. In other words, the second mist nozzle plays a role of supporting the first mist nozzle. Therefore, a part of the air around the pipe provided with the first mist nozzle is taken into the mist flow up to the flame formed by the mist injection from the first mist nozzle by the injection of the second mist nozzle. Can be prevented. As a result, the amount of air sent into the flame is reduced, and in particular, the flame base region is less likely to be disturbed, so that the fire extinguishing effect by mist is sufficiently enhanced. In addition, since the mist flow from the first mist nozzle is reduced by the mist injection from the second mist nozzle described above, the mist entering the flame is more susceptible to heat from the flame than in the past. Become. As a result, it is considered that the ratio of vaporizing in the flame and contributing to fire extinguishing increases. Furthermore, since the mist injected from the second mist nozzle increases the amount of mist in the atmosphere surrounding the flame, the incombustible space can be widened accordingly. In this respect, the second mist nozzle supports the first mist nozzle.

  Further, another fire extinguishing method of the present invention is disposed so as to face the flame base region or the region vertically above the flame base region, and toward the flame base region or the region vertically above the flame base region. Supplying a fire extinguishing agent to a plurality of first mist nozzles to be injected and a plurality of second mist nozzles having an injection angle that does not substantially impede the flow of mist injected from each of the first mist nozzles A step of feeding liquid, a step of injecting mist from each of the first mist nozzles described above, and a mist of each of the above-described second mist nozzles to provide each of the first mist nozzles. And a step of blocking at least a part of the flow of air from the periphery of the pipe to the mist ejected from each of the first mist nozzles.

  According to this fire extinguishing method, a plurality of second mist nozzles having an injection angle that does not substantially impede the flow of mist injected from the first mist nozzle described above are provided from the periphery of the pipe provided with the first mist nozzle. At least a part of the flow of air to the mist injected from the first mist nozzle is blocked. That is, the mist injected from the second mist nozzle does not directly affect the mist injected from the first mist nozzle, but is injected from the first mist nozzle from the periphery of the pipe provided with the first mist nozzle. Block at least part of the flow of air to the mist. In other words, the second mist nozzle plays a role of supporting the first mist nozzle. Therefore, a part of the air around the pipe provided with the first mist nozzle is taken into the mist flow up to the flame formed by the mist injection from the first mist nozzle by the injection of the second mist nozzle. Can be prevented. As a result, the amount of air sent into the flame is reduced, and in particular, the flame base region is less likely to be disturbed, so that the fire extinguishing effect by mist is sufficiently enhanced. In addition, since the mist injection from the second mist nozzle described above reduces the flow rate of the mist from the first mist nozzle as compared with the conventional case, the mist entering the flame is more susceptible to heat from the flame than in the past. Become. As a result, it is considered that the ratio of vaporizing in the flame and contributing to fire extinguishing increases. Furthermore, since the mist injected from the second mist nozzle increases the amount of mist in the atmosphere surrounding the flame, the incombustible space can be widened accordingly. In this respect, the second mist nozzle supports the first mist nozzle.

  By the way, in the present application, the “flame base region” means a columnar space region 300 mm or less vertically above the surface (fuel surface) of the combustible liquid and / or combustible material. However, the “flame base region” does not include the fuel surface. In the present application, “injection direction” means an angle formed by a horizontal plane and the direction of the nozzle.

  According to one fire extinguishing facility of the present invention and one fire extinguishing method of the present invention, by the injection of the second mist nozzle, the mist flows up to the flame formed by the mist injection from the first mist nozzle, It is possible to prevent a part of the air around the pipe including the first mist nozzle from being taken in. Furthermore, since the mist injected from the second mist nozzle increases the amount of mist in the atmosphere surrounding the flame, the incombustible space can be expanded. As a result, the amount of air sent into the flame is reduced, and in particular, the flame base region is less likely to be disturbed, so that the fire extinguishing effect by mist is sufficiently enhanced.

  Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this description, common parts are denoted by common reference symbols throughout the drawings unless otherwise specified. In the drawings, the elements of the present embodiment are not necessarily shown to scale. In addition, in order to make each drawing easy to see, some symbols may be omitted.

<First Embodiment>
FIG. 1 is a configuration diagram illustrating a fire extinguishing facility 100 according to the present embodiment. FIG. 2 is an enlarged plan view of the flow path 11, the pipe 13, the first mist nozzles 12 a,..., 12 a and the second mist nozzles 12 b,. FIG. 3 is a cross-sectional view taken along the line AA in FIG.

  The fire extinguishing equipment 100 of this embodiment shown in FIG.1 and FIG.2 is a plurality of 1st mist via the flow path 11 and the piping 13 by the pump 92 from the tank 94 in which the fire extinguishing agent was stored by one place. , 12a and a plurality of second mist nozzles 12b,..., 12b. The first mist nozzles 12a, ..., 12a and the second mist nozzles 12b, ..., 12b are fitted, screwed, or joined to the pipe 13 by a known technique. Here, the pipe 13, the first mist nozzles 12a,..., 12a, and the second mist nozzles 12b,. The same designation is applied to each of the following embodiments.

In the present embodiment, the area of the fuel surface (or combustion surface) formed below the flame base region 14 is 0.1 m ² . In the present embodiment, the material of the flow path 11, the pipe 13, the first mist nozzles 12 a,..., 12 a and the second mist nozzles 12 b,. In addition, the first mist nozzles 12a,..., 12a and the second mist nozzles 12b,. It is a small mist nozzle described in -235227. The said mist nozzle is a nozzle which can vary the injection angle and / or injection quantity of the mist injected from an orifice by changing the combination of the thin plate which has a several different shape in a housing | casing. Note that a known mist nozzle may be used instead of the mist nozzle described above. In the present embodiment, the aforementioned mist nozzle is employed in order to reduce the weight and size of the entire facility.

  Further, in the present embodiment, as shown in FIG. 1, the first mist nozzles 12 a,..., 12 a are disposed at positions facing the region 16 above the flame base region 14. On the other hand, the plurality of second mist nozzles 12 b,..., 12 b are arranged so that the mist injection direction does not directly face the region 16, and injects mist in opposite directions in one pipe 13. Are arranged as follows.

  By the way, the injection angle of the first mist nozzles 12a,..., 12a of the present embodiment is 90 °, and the injection direction thereof is an elevation angle of 25 ° with respect to the fuel surface. On the other hand, the injection angle of the second mist nozzles 12b,..., 12b of the present embodiment is 75 °, and the injection direction thereof is the first mist nozzle 12a,. The direction of the jet angle of 12a is 90 ° clockwise and 90 ° counterclockwise.

  That is, the injection angle of the first mist nozzles 12a,..., 12a is at least until the mist injected from these mist nozzles reaches the flame base region 14 or the region 16 vertically above the flame base region. The injection angle is set so as not to intersect the injection angle of the second mist nozzles 12b,. By this setting, the flow of mist injected from the first mist nozzles 12a,..., 12a is less affected by the flow of mist injected from the second mist nozzles 12b,. That is, if the flow of mist from the first mist nozzles 12a,..., 12a does not go to the flame base region 14 or the region 16 vertically above the flame base region, the mist substantially contributes to fire extinguishing. Therefore, the second mist nozzles 12b,..., 12b are required to support the flow without disturbing the flow. As shown in FIG. 4, if the injection angle α of the first mist nozzles 12a,..., 12a intersects the injection angle β of the second mist nozzles 12b,. Intersect, in other words, most of the mist injected from the first and second mist nozzles flows in the direction of the region S where the injection ranges overlap, so that the mist is directed in the original intended direction. It was confirmed that it would be difficult.

  Here, the injection direction of the first mist nozzles 12a,..., 12a is directed obliquely upward because a part of the mist to be injected rises along the outer edge of the flame, thereby surrounding the flame. This is because the existing air (including oxygen) forms a barrier that prevents entry into the flame. As a result, the amount of air sent into the flame is reduced, and particularly the flame base region 14 is less likely to be disturbed, so that the fire extinguishing effect by the mist is sufficiently enhanced.

  In particular, when the pipe 13 is arranged on a horizontal plane of 100 mm or less from the upper end of the flame base region 14, the injection direction of the first mist nozzles 12a, ..., 12a disturbs the flame base region 14. In order to avoid this, it is preferable that the elevation angle is 0 ° or more and less than 90 ° with respect to the horizontal plane. However, in order to prevent ambient air from flowing into the flame base region 14 and to sufficiently supply the mist to the flame base region 14, the angle is 10 ° or more and the elevation angle 60 ° or less with respect to the horizontal plane. More preferably. From this point of view, the most preferable range is 20 ° or more and an elevation angle of 45 ° or less with respect to the horizontal plane.

  On the other hand, when the pipe 13 is arranged on the horizontal plane above the flame base area 14 and over 100 mm from the upper end of the flame base area 14, the first mist nozzles 12a,. The injection direction of 12a may face diagonally downward. This is because the injected mist sufficiently receives heat from the flame and is vaporized, but can contribute to extinguishing without greatly disturbing the flame base region 14. However, in order not to disturb the flame base region 14 as much as possible, the first mist nozzles 12a,..., 12a preferably inject mist to the flame except for the fuel surface. The second mist nozzles 12b,..., 12b also preferably have their mist injection direction not directly directed to the fuel surface, but even if they are directed in the direction, the mist itself does not reach the fuel surface. If it is injected at such a flow rate, fire extinguishing is not hindered.

  Further, when extinguishing the fire, it is preferable that substantially the entire area of the flame base region 14 when the flame base region 14 is viewed from vertically above is covered with the injected mist.

  By using the above-described configuration, it is possible to extinguish using mist. For example, after igniting n-heptane placed in an oil tank, a pressure of 0.9 MPa, a flow rate of 0.3 L (liter) / liter is supplied from the plurality of first mist nozzles 12 a,. The fire extinguisher was injected under the condition of min. Further, a fire extinguisher is injected under the conditions of a pressure of 0.9 MPa and a flow rate of 0.4 L (liter) / min. From the plurality of second mist nozzles 12b,. It was.

  In the present embodiment, the first mist nozzles 12a,..., 12a and the second mist nozzles 12b,. In addition, the fire extinguisher of this embodiment is water.

  The above-described mist injection extinguishes the flame in about 45 seconds. The amount of extinguishing agent (water) used at this time was 0.83L. The average flow rate of mist at a distance of 10 cm from the orifice of each first mist nozzle 12a was 5 m / sec. The average flow rate of mist at a distance of 10 cm from the orifice of each second mist nozzle 12b was 4.5 m / sec. That is, the flow rate of the mist injected from the second mist nozzles 12b,..., 12b of the present embodiment is about 90% compared to the flow rate of the mist injected from the first mist nozzles 12a,. Is set to

  Here, a comparative example is shown. The flame was not extinguished as a result of the fire extinguishing experiment using the fire extinguishing equipment having the same configuration as described above except that the pipe 13 did not have the second mist nozzles 12b, ..., 12b. Moreover, the average flow rate of mist at a distance of 10 cm from the orifice of each mist nozzle was 50 m / sec.

  As described above, the flow rate of the mist injected from the first mist nozzles 12a,..., 12a is slowed by the mist injected from the second mist nozzles 12b,. This is because the mist injected from the second mist nozzles 12b,..., 12b is in the mist flow from the first mist nozzles 12a,. One possible reason is that the amount of air taken in is reduced. Further, the second mist nozzles 12b,..., 12b are sprayed with mist having a flow velocity slower than that of the first mist nozzles 12a,. Since the mist injected from 12b substantially increases the amount of mist in the atmosphere surrounding the flame, it can be said that the non-combustible space is expanded accordingly. Therefore, it is thought that the spread of the non-combustible space also contributes to fire extinguishing.

  In this way, by reducing the flow rate of the mist sent to the flame as compared with the conventional case, the time for the mist to pass through the flame, in other words, the time for the mist to contact the flame becomes longer. The amount of heat received from the flame also increases. As a result, since more mist phase changes from liquid to gas, the cooling effect inside the flame at that time and the dilution effect of the oxygen concentration inside the flame due to the expansion of the volume of water vapor that changed the phase of the mist This is considered to be a significant improvement compared to the prior art. In addition, even if it is the mist nozzle arrange | positioned in the conventional opposing piping, the stay of mist in the flame inside or its periphery by the collision of mist is obtained. However, the mist injection from the second mist nozzles 12b,..., 12b employed in the present embodiment is the mist injected from the first mist nozzles 12a,. The point of promoting residence in or around the flame is based on a completely different viewpoint.

  Furthermore, by providing the second mist nozzles 12b,..., 12b, it becomes possible to fill a high-density mist in the entire space including the periphery surrounding the flame. Therefore, the mist from the second mist nozzles 12b,..., 12b can contribute to the active prevention of fire spread by expanding the non-combustible space.

  Therefore, as described above, it is possible to quickly extinguish with a small amount of water. Moreover, although water was used as a fire extinguishing agent in this embodiment, even a pool fire such as the above-described experiment, which is generally difficult to extinguish, was extinguished by water mist. Thereby, the safety to the human body is remarkably increased and the load on the environment is greatly reduced.

  In addition, in this embodiment, although water was used as a fire extinguisher, it is not limited to this. Other alternative fire extinguishing agents that increase fire fighting capability may be applied, although the impact on the human body will increase and the environmental impact will increase. For example, water containing as an additive at least one selected from the group of known extinguishing liquids such as alkaline strengthening liquid and neutral strengthening liquid, surfactants, and alcohols such as ethanol is used in the present embodiment and the following. It can be applied to each modification.

<Modification of First Embodiment>
FIG. 5 is a plan view showing a modification of one mist supply unit of the first embodiment. In this example, except that the mist supply unit 10 of the fire extinguishing facility 100 of the first embodiment is changed to the two mist supply units 20 and 20 shown in FIG. 3, the fire extinguishing facility 100 of the first embodiment. Has the same configuration. As shown in FIG. 3, the two mist supply parts 20 and 20 that are not opposed to each other are arranged in an L shape with respect to the flame to be extinguished.

  Each mist supply unit 20, 20 has a plurality of first mist nozzles 12 a,... Via a flow path 21, 21 and pipes 23, 23 from a tank in which one or two extinguishing agents (not shown) are stored. .., 12a and a plurality of second mist nozzles 12b,..., 12b.

  As described above, since the mist supply units 20 and 20 include the plurality of second mist nozzles 12b,..., 12b, the amount of air sent into the flame is reduced. As a result, particularly the flame base region is less likely to be disturbed. In addition, the mist injected from the mist supply units 20 and 20 arranged in an L shape with respect to the flame collides with each other in or around the flame, so that it is compared with a case where a single mist supply unit is simply arranged. This increases the probability that the mist will vaporize. Therefore, the fire extinguishing effect by the mist is further enhanced by the arrangement of the mist supply units 20 and 20 of the present embodiment.

<Other Modifications of First Embodiment>
FIG. 6 is a cross-sectional view corresponding to FIG. 3 of the first embodiment, showing a modified example of another mist supply unit of the first embodiment. In this example, the mist supply unit 10 of the fire extinguishing equipment 100 of the first embodiment has the same configuration as the fire extinguishing equipment 100 of the first embodiment, except that the mist supply unit 10 shown in FIG. 6 is changed. I have.

  As shown in FIG. 6, the first mist nozzles 12a, ..., 12a and the second mist nozzles 12b, ..., 12b are provided in one pipe 33 as in the first embodiment. The difference from the first embodiment is that the orifices face in opposite directions.

  When the fire extinguishing target is the same as that of the first embodiment, the flame is about 3 by the mist injection from the first mist nozzles 12a,..., 12a and the second mist nozzles 12b,. Fire extinguished in 5 seconds. The amount of fire extinguishing agent (water) used at this time was 0.85 L. The average flow rate of mist at a distance of 10 cm from the orifice of each first mist nozzle 12a was 5 m / sec. The average flow rate of mist at a distance of 10 cm from the orifice of each second mist nozzle 12b was 4.5 m / sec. That is, also in the present embodiment, the flow rate of the mist injected from the second mist nozzles 12b,..., 12b is approximately the same as the flow rate of the mist injected from the first mist nozzles 12a,. It is set to 90%.

  As in the comparative example of the first embodiment and the above, the mist injection direction from the second mist nozzles 12b,..., 12b is the same as the mist injection direction from the first mist nozzles 12a,. Even in the reverse direction, it was confirmed that the mist injected from the second mist nozzles 12b, ..., 12b slows down the flow rate of the mist injected from the first mist nozzle. Therefore, the second mist nozzles 12b,..., 12b of this embodiment can also contribute to fire extinguishing.

<Second Embodiment>
In the fire extinguishing equipment 200 of the present embodiment, the mist supply unit 10 of the first embodiment is changed to the two mist supply units 40a and 40b shown in FIG. 7, and each mist supply unit 40a and 40b is unique. Except for having a supply source, it has the same configuration as the fire extinguishing equipment 100 of the first embodiment. Therefore, the overlapping description is omitted.

  FIG. 7 is a configuration diagram showing the fire extinguishing equipment 200 in the present embodiment. FIG. 8 is an enlarged plan view of the mist supply units 40a and 40b in the fire extinguishing equipment 200 of the present embodiment, and FIG. 9 is a sectional view taken along line BB in FIG.

  As shown in FIGS. 7 to 9, the fire extinguishing equipment 200 of the present embodiment includes two mist supply units 40a and 40b. One mist supply unit 40a is supplied with water to which a known alkaline strengthening liquid is added by a pump 96 from a tank 98 via a flow path 41a. On the other hand, in the mist supply unit 40b, water is supplied from the tank 94 by the pump 92 via the flow path 41b. As a result, the plurality of first mist nozzles 12a,..., 12a spray water with a known alkaline strengthening liquid added to the flame base region 14 or the region 16 directly above the flame base region. The plurality of second mist nozzles 12b, ..., 12b inject water. Here, the injection directions of the plurality of second mist nozzles 12b,..., 12b are the same as those of the first embodiment, as viewed from the cross section shown in FIG. The injection angle is 90 ° clockwise and 90 ° counterclockwise. Moreover, in this embodiment, the injection direction of the first mist nozzles 12a, ..., 12a is an elevation angle of 25 ° with respect to the horizontal plane. In addition, in this embodiment, the material of each member which comprises the mist supply parts 40a and 40b is SUS304.

  In the present embodiment, water mist is ejected from the second mist nozzles 12b,..., 12b of the mist supply unit 40b. The injection angle of the second mist nozzles 12b,..., 12b is based on the flow of mist in which the air around the pipes 43a, 43b is injected from the first mist nozzles 12a,. It is set so as not to be taken in as much as possible and not to substantially hinder the flow of mist injected from the first mist nozzles 12a,.

  By the way, if the distance between the pipe 43a and the pipe 43b is too large, the air around the pipe 43a is taken into the flow of mist injected from the first mist nozzles 12a, ..., 12a of the mist supply unit 40a. Therefore, the existence significance of the second mist nozzles 12b,. Therefore, the distance between the pipe 43a and the pipe 43b is preferably 80 mm or less.

  In the present embodiment, different types of liquid are supplied to each of the two mist supply units 40a and 40b. That is, the first mist nozzles 12a,..., 12a that contribute directly to fire extinguishing are supplied with extinguishing agents that are more effective for fire extinguishing, while the first mist nozzles 12a,. Water is supplied to the second mist nozzles 12b,. For example, for an object that is difficult to extinguish, such as a pool fire (gasoline fire), the cost of fire extinguishing is reduced while achieving efficient fire extinguishing by changing the type of liquid as described above. It becomes possible.

  By using the above-described configuration, it is possible to extinguish using mist. For example, after igniting n-heptane placed in an oil tank, a pressure of 0.9 MPa, a flow rate of 0.3 L (liter) / liter is supplied from the plurality of first mist nozzles 12 a,. The fire extinguisher was injected under the condition of min. Further, water mist is jetted from a plurality of second mist nozzles 12b,..., 12b whose jetting direction is vertically upward and vertically downward, under conditions of a pressure of 0.9 MPa and a flow rate of 0.4 L (liter) / min. It was.

  The above-described mist injection extinguishes the flame in about 4.5 seconds. At this time, the amount of the extinguishing agent used by the first mist nozzles 12a, ..., 12a was 0.225L. The average mist flow rate at a distance of 10 cm from the orifice of each first mist nozzle 12a was 5 m / sec. On the other hand, the amount of water used by the second mist nozzles 12b, ..., 12b was 0.3L. The average flow rate of mist at a distance of 10 cm from the orifice of each second mist nozzle 12b was 4.5 m / sec. Therefore, also in this embodiment, the flow rate of the mist injected from the second mist nozzles 12b,..., 12b is about 90 compared to the flow rate of the mist injected from the first mist nozzles 12a,. % Is set.

  As above-mentioned, it injects from 2nd mist nozzle 12b, ..., 12b provided in the mist supply part 40b different from the mist supply part 40a in which the 1st mist nozzle 12a, ..., 12a was formed. Due to the mist, the flow rate of the mist injected from the first mist nozzles 12a,. This is because the mist injected from the second mist nozzles 12b,..., 12b flows into the mist flow from the first mist nozzles 12a,. One possible reason is that the amount of air in the surrounding area is reduced. Further, the second mist nozzles 12b,..., 12b are sprayed with mist having a flow velocity slower than that of the first mist nozzles 12a,. Since the mist injected from 12b substantially increases the amount of mist in the atmosphere surrounding the flame, it can be said that the non-combustible space is expanded accordingly. Therefore, it is considered that the spread of the non-combustible space also contributes to shortening the fire extinguishing time.

  When extinguishing the fire, the area of the flame base region when the flame base region 14 is viewed from vertically above, in other words, substantially the entire area of the fuel surface (or combustion surface) is covered by the injected mist. It is preferable.

  In the present embodiment, water to which a known alkaline strengthening liquid is added is used as a fire extinguisher, but the present invention is not limited to this. Other alternative fire extinguishing agents that increase fire fighting capability may also be applied. For example, water containing at least one selected from the group of known fire extinguishing liquids such as neutral strengthening liquids, surfactants, and alcohols such as ethanol is used in this embodiment and the following modifications. Applicable. Moreover, in this embodiment, although water mist is injected from the 2nd mist nozzle, it is not limited to this. As described above, since the second mist nozzle plays a supporting role for the first mist nozzle, it is not limited as long as it is a liquid to be misted and does not inhibit fire extinguishing. Specifically, it may be water containing at least one selected from the group of fire extinguishing liquid, surfactant, and alcohol as an additive. However, it is very preferable to select a liquid that does not adversely affect the human body (for example, water or water containing ethanol).

  By the way, in each above-mentioned embodiment, although the flow rate of the mist injected from the 2nd mist nozzle was set to about 90% of the flow rate of the mist injected from the 1st mist nozzle, it is not limited to this numerical value. If the flow rate of the mist from the second mist nozzle is in the range of 30% to 95% with respect to the flow rate of the mist from the first mist nozzle, the flow of mist injected from the first mist nozzle is substantially reduced. Therefore, substantially the same effect as the present invention is achieved.

  Moreover, even if the arrangement of the L-shaped mist supply units 20 and 20 shown as one of the modifications of the first embodiment is applied to the second embodiment, it is substantially the same as the present invention. An effect is produced. As described above, modifications that exist within the scope of the present invention are also included in the claims.

  The present invention can be widely used as a fire extinguishing equipment or a fire extinguishing method for various fires.

It is a schematic structure figure showing fire extinguishing equipment in one embodiment of the present invention. It is a one part enlarged plan view of the fire extinguishing equipment in one embodiment of the present invention. It is AA sectional drawing of FIG. It is explanatory drawing of a virtual example. It is a top view of the mist supply part of the fire extinguishing equipment in other embodiments of the present invention. It is sectional drawing corresponded in FIG. 3 in other embodiment of this invention. It is a schematic block diagram which shows the fire extinguishing equipment in other embodiment of this invention. It is a one part enlarged plan view of the fire extinguishing equipment in other embodiments of the present invention. It is BB sectional drawing of FIG. It is a figure explaining the ejection angle of mist.

Explanation of symbols

10, 20, 30, 40a, 40b Mist supply section 11, 21, 41a, 41b Flow path 12a, 12b, 18 Mist nozzle 13, 23, 33, 43a, 43b Piping 14 Flame base area 16 Vertically above flame base area Area 92, 96 Pump 94, 98 Tank 100, 200 Fire extinguishing equipment

Claims (9)

A plurality of first mist nozzles disposed opposite to a flame base region or a region vertically above the flame base region and sprayed toward a region vertically above the flame base region or the flame base region;
A mist that has an injection angle that does not intersect with an injection angle of each of the first mist nozzles and that is slower than the flow rate of the mist that is injected from each of the first mist nozzles, and each of the first mist nozzles is A plurality of second mist nozzles for injecting mist for blocking at least part of the flow of air from the periphery of the provided pipe to the mist injected from each of the first mist nozzles;
A feeding device for feeding a fire extinguishing agent to each of the first mist nozzles;
Fire extinguishing equipment comprising a feeding device that feeds liquid to each of the second mist nozzles. A plurality of first mist nozzles disposed opposite to a flame base region or a region vertically above the flame base region and sprayed toward a region vertically above the flame base region or the flame base region;
It has an injection angle that does not substantially interfere with the flow of mist injected from each of the first mist nozzles, and is injected from each of the first mist nozzles from the periphery of a pipe provided with each of the first mist nozzles. A plurality of second mist nozzles for injecting mist for blocking at least part of the flow of air to the mist;
A feeding device for feeding a fire extinguishing agent to each of the first mist nozzles;
Fire extinguishing equipment comprising a feeding device that feeds liquid to each of the second mist nozzles. The fire extinguishing equipment according to claim 1 or 2, wherein the liquid is the fire extinguishing agent, and the first mist nozzles and the second mist nozzles are arranged in one pipe. The fire extinguishing equipment according to claim 1 or 2, wherein each of the first mist nozzles and each of the second mist nozzles inject mist except for a fuel surface. The fire extinguishing equipment according to claim 1 or 2, wherein the fire extinguishing agent and the liquid are water or water containing at least one selected from the group of a fire extinguishing chemical, a surfactant, and an alcohol as an additive. A fire extinguishing agent is disposed on the flame base region or a region vertically above the flame base region and sprays to the plurality of first mist nozzles that are sprayed toward the flame base region or the region vertically above the flame base region. A process of feeding
Liquid is supplied to a plurality of second mist nozzles that have a spray angle that does not intersect with the spray angle of each of the first mist nozzles and that sprays a mist that is slower than the flow rate of the mist sprayed from the first mist nozzle. Process,
Spraying mist from each of the first mist nozzles;
By injecting mist from each of the second mist nozzles, at least part of the flow of air from the periphery of the pipe provided with each of the first mist nozzles to the mist injected from each of the first mist nozzles. A fire extinguishing method. A fire extinguishing agent is disposed on the flame base region or a region vertically above the flame base region and sprays to the plurality of first mist nozzles that are sprayed toward the flame base region or the region vertically above the flame base region. A process of feeding
Supplying liquid to a plurality of second mist nozzles having an ejection angle that does not substantially interfere with the flow of mist ejected from each of the first mist nozzles;
Spraying mist from each of the first mist nozzles;
By injecting mist from each of the second mist nozzles, at least part of the flow of air from the periphery of the pipe provided with each of the first mist nozzles to the mist injected from each of the first mist nozzles. A fire extinguishing method. The fire extinguishing method according to claim 6 or 7, wherein the liquid is the fire extinguishing agent, and the first mist nozzles and the second mist nozzles are arranged in one pipe. The fire extinguishing method according to claim 6 or 7, wherein each of the mist nozzles injects the mist with respect to a flame except for a fuel surface.

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